共查询到19条相似文献，搜索用时 93 毫秒
1.
戴忠青 《安徽科技学院学报》2001,(3)
:65 0 0 2作为杂交中稻进行旱育抛栽时 ,以秧龄在 2 5d左右 ,抛栽密度 17株 /m2 ,纯N施用量 180kg/hm2 ,N肥运筹以基肥∶蘖肥∶穗肥 =7∶1∶2为宜 ,考虑到 65 0 0 2灌浆期长 ,扬花期前后各要防治一次稻曲病 相似文献
2.
播种量和氮肥用量对"绿旱一号"旱直播栽培穗部性状及产量的影响 总被引：5，自引：0，他引：5
采用大田随机区组设计,研究了播种量和氮肥用量对"绿旱一号" 旱直播栽培穗部性状及产量的影响.结果表明:在氮肥水平相同的条件下,随着播种量的提高有效穗数增加,穗长、穗实粒数及分枝数下降;在播种量较低的条件下,增加氮肥用量可提高有效穗数和穗长度,但在高播量的情况下,增加氮肥用量对增加有效穗数及穗长度效果不明显;播种量和氮肥用量对穗粒数、粒重及着粒密度影响效果不明显;各个处理中,以A2B2处理产量最高,A2B3处理的产量次之,即播种量在40～60kg/hm2范围内,氮肥用量(纯氮)在270kg/hm2左右易获得高产. 相似文献
3.
戴忠青 《安徽技术师范学院学报》2001,15(3):19-20
65002作为杂交中稻进行旱育抛栽时，以秧龄在25d左右，抛栽密度17株/m^2，纯N施用量180kg/hm^2，N肥运筹以基肥；蘖肥，穗肥＝7：1：2为宜，考虑到65002灌浆期长，扬花期前后各要防治一次稻曲病。 相似文献
4.
本文报道了基施氮肥用量及播种量对小麦产量的影响。结果表明 :基施氮肥用量以 91 .1kg/hm2 纯氮为宜 ,播种量以 1 1 2 .5kg/hm2 为宜 ,小麦产量达 8380kg/hm2 。 相似文献
5.
通过田间试验,研究了施用90、180、270、360kg/hm2的氮肥对播娘蒿生长和产量的影响.结果表明:施用氮肥能显著增加播娘蒿的产量,与对照相比,施用氮肥处理的分枝数、单株角果数、株高、千粒重均显著增加. 相似文献
6.
目的:通过小区试验研究了不同施氮量对诸葛菜的生长和籽粒产量的影响,确定适宜的施氨水平,为沿淮地区诸葛菜高产栽培提供参考.方法:采用单因素随机区组设计,设置五种不同施氮量尿素(0 kg/hm2、110.00 kg/hm2、143.33 kg/hm2、176.67 kg/hm2、210.00 kg/hm2),测定诸葛菜的生长指标和产量指标.结果:不同氮肥处理间诸葛菜的株高、主花序有效长度、主花序有效角果数、二次分枝、秸秆干重、全株有效角果数、每角果粒数和籽粒产量差异达到显著水平,其余指标未达到显著水平.随着施氮量的增加,诸葛菜的株高、根颈粗、二次分枝数、主花序有效长度、主花序有效角果数、每角果粒数及秸秆干重均呈现增加趋势,而全株有效角果数、千粒重、产量等均呈现先增加后下降趋势.结论:沿淮地区诸葛菜施氮水平为176.67 kg/hm2时,产量达到最高为796.67 kg/hm2. 相似文献
7.
本文通过对水稻分蘖成穗与产量组成数量关系的分析表明：提高成穗率即可提高产量及其组成因子;群体穗数与产量多呈负相关,单株穗数与产量多呈正相关;群体的苗、茎（蘖）、穗与成穗率多呈负相关,单株的茎（蘖）、穗与成穗率多呈正相关。 相似文献
8.
粳稻新品种产量与产量性状的逐步回归及通径分析 总被引：1，自引：0，他引：1
研究常规粳稻的产量性状对产量的效应,为粳稻育种实践中选择相关性状提供信息.采用逐步回归与通径分析方法,对2011年河南省粳稻新品种区试结果进行分析.结果表明:各因素对产量的最终效应(绝对值)为:穗总粒数＞千粒重＞穗长＞公顷穗数,穗总粒数、穗长均为正效应,千粒重、公顷穗数均为负效应,公顷穗数通过穗长、穗总粒数对产量的间接负效应较强.穗数每增加1万穗/hm2,增产31.03 kg/hm2;穗长每增加1 cm/穗,增产203.17 kg/hm2;穗总粒数每增加1粒/穗,增产20.46 kg/hm2;而千粒重每增(减)1g,产量减(增)71.55 kg/hm2.模拟得出稻谷产量8 265～10 125 kg/hm2的产量结构为:公顷穗数316.48～323.15万穗/hm2,穗长17.63～18.89 cm,穗总粒数119.21～147.07粒/穗,千粒重22.35～24.82 g.在高产育种实践中应以增穗总粒数和穗长、适控总穗数、保千粒重为主攻方向,各产量因素优化协调是实现粳稻高产目标的根本保障. 相似文献
9.
节水灌溉模式下,不施氮肥能够明显提前成熟,不同氮肥用量对新麦19的生育进程没有明显影响.成穗数在氮肥用量大(12～20 kg/667m2以上)时较高,在氮肥用量少(8 kg/667m2以下)时较低;穗粒数在氮肥用量8～16kg/667m2时较高,不施氮肥的处理穗粒数最少;千粒重随着氮肥用量的增加呈下降趋势.施用氮肥能够明显降低新麦19的黑胚率和秕籽率.全程施氮量为16 kg/667m2(即底肥9.6 kg/667m2、拔节期追肥6.4 kg/667m2)时,产量最高、最经济. 相似文献
10.
生态肥与化肥配施对小麦生长发育及产量的效应研究 总被引：2，自引：0，他引：2
采用生态肥与等量氮、P2O5和K2O不同比例配施与传统施肥方式比较,研究其对小麦生长发育及产量的效应.结果表明:不同肥料结构和用量对拔节后的群体影响显著.处理基部1~3节节间长增加,其增加幅度从28.6%依次降低到7.4%.不同生育期主要器官干物质积累量明显增加.其功能叶面积变化与生育期、茎蘖位和叶位有关.功能叶面积孕穗期比灌浆期高60.2%;主茎比蘖一高14%,比蘖二高72.7%;不同叶位叶面积大小均表现倒二叶>倒三叶>旗叶.处理平均比CK增产4.7%.在所有处理中,以9 kg/hm2生态肥与纯氮、P2O5和K2O各60.75 kg/hm2的养分结构效果最好,比CK增产5.8%. 相似文献
11.
ＩＮＴＲＯＤＵＣＴＩＯＮＶｉｓｉｂｌｅａｎｄｎｅａｒｉｎｆｒａｒｅｄｒｅｆｌｅｃｔｉｏｎｓｐｅｃｔｒｏｓ ｃｏｐｙｗａｓｐｒｏｖｅｄｉｎｒｅｃｅｎｔｙｅａｒｓｔｏｏｆｆｅｒｔｈｅｐｏｓ ｓｉｂｉｌｉｔｙｏｆｏｂｔａｉｎｉｎｇａｒａｐｉｄ ,ｎｏｎ ｄｅｓｔｒｕｃｔｉｖｅｅｓｔｉ ｍａｔｉｏｎｏｆｐｌａｎｔｎｉｔｒｏｇｅｎｃｏｎｔｅｎｔｓ(Ｔｈｏｍａｓｅｔａｌ.,1 972 ;Ｈｉｎｚｍａｎｅｔａｌ.,1 986;Ｔａｋｅｂｅｅｔａｌ.,1 990 ;Ｆｉｌｅｌｌａｅｔａｌ.,1 995;Ｂｌａｃｋｍｅｒｅｔａｌ.,1 994 ,1 996;Ｌａｄｈａ… 相似文献
12.
A field experiment was conducted to study the response of individual leaf spectral reflectance to five levels of nitrogen
fertilizer treatments in rice (Oriza sativa L.) plants. Sampling was combined through a rice canopy at upper, medium and low levels for biomass, nitrogen and water content
measurements with spectral signals from the leaves. The vertical gradients of leaf biomass, nitrogen and water contents were
associated with the nitrogen availability during tillering, panicle formation, initial heading and heading. Rice plants treated
with the lowest rate of N could be characterized with the lowest value of gradient in leaf biomass and leaf water content
and the highest value of gradient in leaf N concentration. A spectral gradient of single reflectance (R), ratio (RVI) and
normalized difference (ND) of two individual reflectances was defined as this yielded a better relationship between the spectral
data and leaf nitrogen concentration. The results suggested the spectral gradients may be used as an improved diagnostic tool
for nitrogen status.
Project (49771056) supported by Natural Science Foundation of China(NSFC). 相似文献
13.
通过对不同基追肥比例对烤烟干物质累积和碳氮代谢的影响研究,结果表明：1．烤烟干物质累积主要集中在移栽后30～60d,在同等施肥量条件下,随着追肥比例的提高后期干物质累积强度越大且累积量也越大．叶部干物质累积主要集中在30—60d,烟茎干物质累积在移栽后45～75d,根部干物质累积主要在45～60d,各部位干物质累积量均表现为随着追肥比例的提高而增大．2．叶片光合速率在30d时迅速下降,光合稳定阶段主要在45—60d,且随着追肥比例的提高光合速率越小,超过70％光合作用又有所升高,光合速率60d后开始迅速下降,75d时下降速率开始变缓,并且随着追肥比例的升高下降速率越缓．烟叶叶绿素含量在生长前期变化不大,且受基追肥比例的影响也较小;后期迅速降低,追肥比例越高,后期叶绿素含量相对越大．3．前期烤烟体内硝酸还原酶含量较高,从45d开始迅速下降,60d以后基本稳定且略有升高．4．烟叶产量随着追肥比例的提高而提高,超过70％时产量明显降低,基追肥配合施用产量均高于基肥和追肥单施处理．产值、均价、上等烟比例和中上等烟比例综合比较以处理C为最优． 相似文献
14.
We characterized yield-relevant characters and their variations over genotypes and environments (locations and years) by examining two rice varieties (9746 and Jinfeng) with high yield potential.9746 and Jinfeng were planted in two locations of Shanghai,China,during 2005 and 2006.The results show that there was a large variation in grain yield between locations and years.The realization of high yield potential for the two types of rice was closely related to the improved sink size,such as more panicles per square meter or grains per panicle.Stem and leaf biomasses were mainly accumulated from tillering stage to heading stage,and showed slow decline during grain filling.Meanwhile,some photosynthetic characters including net photosynthesis rate (Pn),leaf area index (LAI),specific leaf area (SLA),fluorescence parameter (maximum quantum yield of PSII,Fv/Fm),chlorophyll content (expressed as SPAD value),as well as nutrient (N,P,K) uptake were also measured to determine their variations over genotypes and environments and their relationships with grain yield.Although there were significant differences between years or locations for most measurements,SLA at tillering and heading stages,Fv/Fm and LAI at heading stage,stem biomass at heading and maturity stages,and leaf nitrogen concentration at tillering and heading stages remained little changed,indicating their pos-sible applications as selectable characters in breeding programs.It was also found that stem nitrogen accumulation at tillering stage is one of the most important and stable traits for high yield formation. 相似文献
15.
为确定烤烟专用基肥中合理经济的硝态氮比例,对烤烟基肥中不同硝态氮比例对烤烟生长、产质量的影响进行了研究.结果表明,在烤烟生长的前期,各农艺性状随着硝态氮比例的增加而升高;在现蕾期各农艺性状随着硝态氮比例的增加而也有升高的趋势,但当硝态氮比例达50%时各农艺性状又下降.各处理经济性状有相同的变化趋势,以硝态氮比例为45%的处理各项指标表现较好,当硝态氮比例增加到50%时,各指标又降低.随着硝态氮比例的提高有利于烤烟的正常落黄成熟,但当硝态氮含量过高时（超过45%）不利于烤烟分层落黄.各部位烟叶的总糖、还原糖和钾含量有随着硝态氮比例的增加而升高的趋势,但当硝态氮比例增加到45%时总糖和还原糖降低,各部位烟叶的总氮、烟碱和蛋白质的含量有随着硝态氮比例的增加而降低的趋势,硝态氮比例增加到45%时总氮、烟碱和蛋白质的含量又都升高,氯含量没有明显的变化规律. 相似文献
16.
Field experiments were conducted in farmers’ rice fields in 2001 and 2002 to study the effects of nitrogen (N) management
strategies on N use efficiency in recovery (RE), agronomy (AE) and physiology (PE) and redistribution of dry matter accumulation
(DMA) and nitrogen accumulation (NA) in two typical rice cultivars in Jinhua, Zhejiang Province. This study aimed mainly at
identifying the possible causes of poor fertilizer N use efficiency (NUE) of rice in Zhejiang by comparing farmers’ fertilizer
practice (FFP) with advanced site-specific nutrient management (SSNM) and real-time N management (RTNM). The results showed
that compared to FFP, SSNM and RTNM reduced DMA and NA before panicle initiation and increased DMA and NA at post-flowering.
There is no significant difference between SSNM and FFP in post-flowering dry matter redistribution (post-DMR) and post-flowering
nitrogen redistribution (post-NR). These results suggest that high input rate of fertilizer N and improper fertilizer N timing
are the main factors causing low NUE of irrigated rice in the farmer’s routine practice of Zhejiang. With SSNM, about 15%
of the current total N input in direct-seeding early rice and 45% in single rice could be reduced without yield loss in Zhejiang,
China.
Project supported by the International Rice Research Institute (IRRI), Swiss Agency for Development and Cooperation (SDC),
the Potash & Phosphate Institute and the Potash & Phosphate Institute of Canada (PPI-PPIC), the International Fertilizer Industry
Association (IFA), the International Potash Institute (IPI), and 948 Project of the Ministry of Agriculture of China (No.
2003-Z53) 相似文献
17.
对小麦茎秆进行受力分析,运用挠曲线近似方程的叠加,势能驻值原理,建立了茎秆在穗重和风载双重作用下茎秆抗倒伏的精确模型,并给出临界风力的具体表达式.结果表明：茎秆的高度越高,承载的临界力越小,但并不是简单的反比例关系;抗弯刚度与倒伏临界力成显著的正线性相关;单穗重的增加也会降低抗倒伏临界力. 相似文献
18.
在品种和施氮量相同的条件下,施氮方法对植株吸氮有很大影响.前期控氮,中期补施穗肥的方法可延长植株吸氮高峰持续时间,增加植株氮素总积累量,对防止植株早衰,增加稻谷产量,提高氮肥利用率,都有良好的作用. 相似文献
19.
本文采用二因素随机区组试验,探讨了不同NPK养分,不同磁化处理的磁性化肥对杂交水稻产量及产量构成因素的影响。统计结果表明:不同磁肥对水稻产量的影响差异达到了极显著水平,其中以N_3P_1K_1×磁化粉煤灰(2000GS磁化处理)的磁肥的效果最好。养分与磁处理间存在显著互作反应,不同磁肥对有效穗数,每穗实粒数的影响均极显著,但对千粒重的影响不显著,水稻产量与有效穗数的偏相关程度较大,水稻产量约70％可由每株有效穗数、每穗实粒数的变异决定,NPK养分是磁肥主成分,其效应大于磁效应,且磁效应与养分有关。 相似文献